An Anti-Interference Synchronization for OFDM Systems Based on Scrambling Sequence

Yang, Min; Gu, Fengshou; Liu, Jun

doi:10.1109/access.2019.2908017

Cited by 11 publications

(6 citation statements)

References 9 publications

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“…The time-domain unweighted repetitive sequence of the received preamble after taking out the timing position d0 is subjected to the shift correlation operation. Since the correlation between signal and noise or between noise and noise is very small, it can be ignored as an interference term in the theoretical derivation, so we can get [30,52]…”

Section: Frequency Offset Estimationmentioning

confidence: 99%

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A Robust Time-Frequency Synchronization Method for Underwater Acoustic OFDM Communication Systems

Yang,

Wang,

Peng

et al. 2024

IEEE Access

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The strong multipath and long delay extensions can lead to large errors in the timing offset estimation and carrier frequency offset estimation of the Orthogonal Frequency Division Multiplexing (OFDM) underwater communication system, resulting in significant performance degradation. Therefore, this paper proposes a robust time-frequency synchronization method for OFDM systems. First, a new preamble based on Constant Amplitude Zero Autocorrelation (CAZAC) sequence is designed, and a new signal timing offset estimation method is developed based on the time domain characteristics of the preamble. Secondly, a two-stage frequency offset estimation (CFO) method is designed in the time domain followed by the frequency domain, which achieves a wide range of high-accuracy frequency offset estimation. Finally, an adaptive threshold signal first-arrival path detection method is proposed to achieve reliable detection of the position of the signal first-arrival path under complex multipath channels. The simulation, pool, and lake experiment results are provided to verify the reliability and effectiveness of this method. Compared with the traditional methods, the proposed method can more accurately obtain the signal timing position and estimate the CFO in complex multipath channels, and at the same time greatly expand the estimation range of the CFO.INDEX TERMS Carrier frequency offset, time synchronization, OFDM, underwater acoustic communications.

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Section: Frequency Offset Estimationmentioning

confidence: 99%

“…CAZAC has desirable cyclic autocorrelation properties and hence is mostly used as a signal synchronization preamble in communication systems [28][29][30]. CAZAC sequences include a variety of sequences, such as Zadoff-Chu sequences [31] and Heimiller sequences [32].…”

Section: Introductionmentioning

confidence: 99%

A Robust Time-Frequency Synchronization Method for Underwater Acoustic OFDM Communication Systems

Yang,

Wang,

Peng

et al. 2024

IEEE Access

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“…The new waveforms had robust timing and frequency synchronization and very low PMEPR, compared to waveforms that had been built using traditional CAZAC sequences. In 2019, Yang et al [ 30 ] proposed a new synchronization algorithm, which was based on scrambling sequences, to improve the synchronization performance of OFDM systems in the presence of interference. This redesigned the training sequence with CAZAC sequences and additional scrambling operations.…”

Section: Related Workmentioning

confidence: 99%

Timing and Frequency Synchronization Using CAZAC Sequences for OFDM Systems

Peng

et al. 2023

Sensors

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Since orthogonal frequency division multiplexing (OFDM) systems are very susceptible to symbol timing offset (STO) and carrier frequency offset (CFO), which cause inter-symbol interference (ISI) and inter-carrier interference (ICI), accurate STO and CFO estimations are very important. In this study, first, a new preamble structure based on the Zadoff–Chu (ZC) sequences was designed. On this basis, we proposed a new timing synchronization algorithm, called the continuous correlation peak detection (CCPD) algorithm, and its improved algorithm: the accumulated correlation peak detection (ACPD) algorithm. Next, the correlation peaks that were obtained during the timing synchronization were used for the frequency offset estimation. For this, the quadratic interpolation algorithm was adopted as the frequency offset estimation algorithm, which was better than the fast Fourier transform (FFT) algorithm. The simulation results showed that when the correct timing probability reached 100%, under the parameters of m = 8 and N = 512, the performance of the CCPD algorithm was 4 dB higher than that of Du’s algorithm, and that of the ACPD algorithm was 7 dB. Under the same parameters, the quadratic interpolation algorithm also had a great performance improvement in both small and large frequency offsets, when compared with the FFT algorithm.

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“…To complete data communication between wireless nodes, the whole protocol stack needs to run. The Zstack adds a layer of real-time manipulation called OSAL [ 16 ], which operates on top of the OSAL, and the OSAL, a priority-based rotating system, allows for task switching and memory management [ 17 ]. The whole system starts from the main function in the ZMain.…”

Section: System Requirement Analysismentioning

confidence: 99%

Design of Nuclear Radiation Monitoring System in Floor Exploration Based on Deep Learning

Zong

2022

Computational Intelligence and Neuroscience

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Nuclear radiation environmental monitoring has become an important issue in floor surveys. From the perspective of regional environmental nuclear radiation monitoring, it is of great practical significance to establish a scientific and reliable wireless sensor monitoring network for timely and accurately grasping nuclear radiation status and ensuring nuclear safety. In this article, we design a regional environmental nuclear radiation monitoring system based on Zigbee wireless sensor network by using Zigbee wireless technology. First, the network topology suitable for nuclear radiation environment monitoring is designed. Second, the JN5121 module is selected as the core of the Zigbee wireless sensor to build the network hardware platform. Finally, the article focuses on the receiving mechanism, data transmission, coordination between network nodes, network structure, and dynamic network management, and carries on the software development to the Zigbee wireless environment monitoring network. The system can measure the data in real time, display the dose rate of y radiation effectively, and realize the functions of remote control, field control, security alarm, and environmental monitoring. It has good promotion and application value.

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An Anti-Interference Synchronization for OFDM Systems Based on Scrambling Sequence

Cited by 11 publications

References 9 publications

A Robust Time-Frequency Synchronization Method for Underwater Acoustic OFDM Communication Systems

A Robust Time-Frequency Synchronization Method for Underwater Acoustic OFDM Communication Systems

Timing and Frequency Synchronization Using CAZAC Sequences for OFDM Systems

Design of Nuclear Radiation Monitoring System in Floor Exploration Based on Deep Learning

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